:root { --max: 1100px; --pad: 16px; --radius: 18px; }
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; line-height: 1.4; }
header { padding: 28px var(--pad); border-bottom: 1px solid rgba(0,0,0,.08); }
main { max-width: var(--max); margin: 0 auto; padding: 26px var(--pad) 64px; }
h1 { font-size: 34px; margin: 0 0 8px; letter-spacing: -0.02em; }
p.lead { font-size: 18px; margin: 0; opacity: .85; }
.grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 22px; }
@media (min-width: 980px) { .grid { grid-template-columns: 1.2fr .8fr; } }
.card { border: 1px solid rgba(0,0,0,.10); border-radius: var(--radius); padding: 18px; background: #fff; box-shadow: 0 10px 30px rgba(0,0,0,.04); }
label { display:block; font-weight: 600; margin: 10px 0 6px; }
input, select { width: 100%; padding: 10px 12px; border: 1px solid rgba(0,0,0,.18); border-radius: 12px; font-size: 15px; }
.row { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .row { grid-template-columns: 1fr 1fr; } }
button { cursor:pointer; width: 100%; padding: 11px 12px; border: 0; border-radius: 14px; font-weight: 700; font-size: 15px; background: #111; color: #fff; margin-top: 14px; }
small { opacity: .75; }
.result { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 14px; white-space: pre-wrap; }
hr { border: 0; border-top: 1px solid rgba(0,0,0,.10); margin: 14px 0; }
footer { max-width: var(--max); margin: 0 auto; padding: 18px var(--pad) 48px; opacity: .75; }
.badge { display:inline-block; padding: 3px 10px; border-radius: 999px; border: 1px solid rgba(0,0,0,.14); font-size: 12px; margin-left: 10px; }
a { color: inherit; }
ul { margin: 8px 0 0 20px; }